Token Ring Station Attachment by Fiber Optics
Original Publication Date: 1988-Nov-01
Included in the Prior Art Database: 2005-Feb-15
This article is concerned with optical fiber attachment of stations to a Multistation Access Unit (MAU) in a Token Ring system. Usually, in systems providing four-wire station attachment cables, phantom-current information is used for the station insertion process. A particular solution is proposed here by which this phantom-current station insertion information can be transmitted as an optical signal through the optical fiber link. (Image Omitted) In known Token Ring systems, MAUs are interconnected in a closed ring by an electrical cable, and each station is connected to a MAU by a cable using one twisted pair for inbound and another one for outbound traffic. A phantom current over the cable is used to energize a relay in the MAU for station insertion.